| article html file updated | 6 February 2020 08:45 CET | Update | https://www.mdpi.com/1422-0067/15/4/6990 |
| article html file updated | 20 September 2019 07:38 CEST | Update | N/A |
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| article pdf uploaded. | 22 April 2014 10:41 CEST | Version of Record | https://www.mdpi.com/1422-0067/15/4/6990/pdf |